Buffer layers on metal surfaces having biaxial texture as superconductor substrates

Abstract

Buffer layer architectures are epitaxially deposited on biaxially-textured rolled substrates of nickel and/or copper and their alloys for high current conductors, and more particularly buffer layer architectures such as Y2O3/Ni, YSZ/Y2O3/Ni, RE2O3/Ni, (RE=Rare Earth), RE2O3/Y2O3/Ni, RE2O3/CeO2/Ni, and RE2O3/YSZ/CeO2/Ni, Y2O3/Cu, YSZ/Y2O3/Cu, RE2O3/Cu, RE2O3/Y2O3/Cu, RE2O3/CeO2/Cu, and RE2O3/YSZ/CeO2/Cu. Deposition methods include physical vapor deposition techniques which include electron-beam evaporation, rf magnetron sputtering, pulsed laser deposition, thermal evaporation, and solution precursor approaches, which include chemical vapor deposition, combustion CVD, metal-organic decomposition, sol-gel processing, and plasma spray.

We claim: 
     
       1. A biaxially textured article comprising: (A) a substrate comprising at least one metal, the substrate having a surface exhibiting biaxial texture; and   (B) a buffer layer selected from the group consisting of Y 2  O 3  and RE 2  O 3 , the buffer layer being epitaxially disposed upon the biaxially-textured surface of the substrate.   
     
     
       2. The biaxially textured article as described in claim 1 wherein the buffer layer is a first buffer layer comprising Y 2  O 3 , and the biaxially textured article further comprises: (C) a second buffer layer selected from the group consisting of RE 2  O 3  and YSZ, the second buffer layer being epitaxially disposed upon the biaxially textured surface of the Y 2  O 3 .   
     
     
       3. A biaxially textured article comprising: (A) a substrate comprising at least one metal, the substrate having a surface exhibiting biaxial texture;   (B) a first buffer layer comprising CeO 2 , the first buffer layer being epitaxially disposed upon the biaxially textured surface of the substrate; and   (C) a second buffer layer selected from the group consisting of Y 2  O 3  and RE 2  O 3 , the second buffer layer being epitaxially disposed upon the biaxially textured surface of the CeO 2 .   
     
     
       4. A biaxially textured article comprising: (A) a substrate comprising at least one metal, the substrate having a surface exhibiting biaxial texture;   (B) a first buffer layer comprising CeO 2 , the first buffer layer being epitaxially disposed upon the biaxially textured surface of the substrate;   (C) a second buffer layer comprising YSZ, the second buffer layer being epitaxially disposed upon the biaxially textured surface of the CeO 2  ; and   (D) a third buffer layer selected from the group consisting of Y 2  O 3  and RE 2  O 3 , the third buffer layer epitaxially disposed upon the surface of the YSZ.   
     
     
       5. A biaxially textured article comprising: (A) a substrate comprising at least one metal, the substrate having a surface exhibiting biaxial texture; and   (B) a buffer layer comprising (RE') x  O y , wherein x is about 2.0, and y is between about 3.0 and about 3.7, the buffer layer being epitaxially disposed upon the biaxially textured surface of the substrate.